ok.. lets go slowly here.. there is no bike NCT or anything like it so I wasn't suggesting the people who are fanatical about bikes should not be subject to your imaginary test
All I was saying is that HemmY got straight into trying to suggest that RTB was negligent about bike maintenance, and I pointed out that this is unlikely given the standard of bike he is cycling and his constant posting about his biking travails. It was a chain slip and the bike he is riding is a finely tuned instrument, it is unlikely he was cycling around with his derailleur out of sync, worn cassette or rings, stretched chain to that extent etc etc.
OK try apply that principle you have for cyclist to cars - it doesn't excuse petrolheads from having to get their cars NCT nor should it excuse other road users from checking that their vehicles are roadworthy and don't pose a danger to themselves or other users. Yes it's a bit tongue in cheek suggesting cyclists should have to do an NCT on their bikes but I think even you can see what I meant